Improved shaft-coupling



T. W. PORTER, or BoSTo-N, MASSACHUSETTS.

`Letters Patent No. `78,827, dated June 9, 1868.

IMPnov-nn SHAFT-consulte.'

@te .5:13am marit tu in ttes tsiters zxitnt mit mating pnt nf tigttime..

To ALL ivi-10M 1T MAY ooNoERN:

Be it-knovrn that I, T. W. PORTER, of Boston, in the county of Suffolk,and State of Massachusetts, have invcnteda new and usefulShafting-Coupling; and I do hereby declare that the following is'a full,clear, and exact ldescription of the construction and operation ofthesame, reference being had to the accompanying drawings, and to theletters of referencemarked thereon, making a part of,this specification,in which- Figure I is a perspective view of the coupling applied to theshafting.

Figure 2.is a perspective view of the same taken apart, and

. Figure Bis a cross-section of iig. l.

Similarletters of reference-indicate correspondingparts. in the severalfigures,

The nature of my invention consists informing a coupling, in two partsor halves, divided by a longituinal linc, with a. xed key, or its4equivalent,formed or fitted to one half, which, by iitting into a.4key-way or recess in the shaft, and the two'parts of the coupling beingbolted together upon the shaft, at the joint, connect the parts of theshaft firmly together, producing a simultaneous rotary motion in all itsparts or sections.

'Io renable others skilled in the art to make and use my invention, Iwill describe its construction and operation.

,In thedrawings, A and A represent the two'halves of thecoupling. B andB' are the two parts of the shaft-ing to be coupled together. l Y

In the'face or flut sides of tlr'e tivo halves of the coupling is formeda groove or channelyas is clearly shown ing..2. 'These channels Iusually form with their sides, 7L h, at an angle of about fortyvedegrees with thc face of thecoupling, and of such size as will insure abearing upon the shaft "before the faces of 'the coupling are broughttogether. By thus forming the grooves, the shaft has a hearing upon fouropposite sides, thereby' holding the shaft perfectly in line. Thebearing of the shaftin the groovesis clearly shown in fig. 3.

In thebottom of the groove, in A', is a key, a, which is a part of thecoupling itself, and fitsinto the key- .vay b, in the parts of theshaftVB and B. t

In the bottom of the groove, in A, are inserted two pins, c `and d.. Thelongerlone, c, ts into holef in shaft l B, while the shorter one ts intothe groove e, in shaft B. Y j

- In heavy lines of shaft-ingthe key @should be formed in one half ofthecoupling, as shown, andtwo pins or projections, similar to ,'should beformed or inserted in the' other halfLwitha groove, c, formed in, eachpart of the shaft, so 'that the key fitting into the key-way b insuresthe uniform rotary motion of all parts of the shaft, while the pins orknobs el, tting into the grooves e, prevent the thrust or Aworkingasunder of the parts of the shaft. But in light shafting two pins,similar to` c, inserted in one half of the coupling, -and fitting intocorresponding holes in the-shafting, serve the double 4purposeofpreventing the parts of'the shaft fromend-play, and also receive andimpart the torsional strain.

The two halves of the coupling are bolted together upon the shaft by the4screw-bolts z'z', which have seats in recesses in the coupling, asShown iu'iigs. l and 3.

Thefollowing are among the advantages of thiscoupling It is lighter thanany other, and of less-expense, and being self-centring, requires noaccurate fitting, except thckey and key-way. In finishing, all parts areoutside work, and from its form it can be cast more nearly ready for usethan any other, while it can be removed from the shafting without movingthe shafting asunder, and it is free from the constant diicultiesarisingfrom being too loose or too tight, the pressure upon the shaftbeing regulated by the screw-bolts, and only for nthe purpose of holdingthe shaft in line, while the torsionalstrain and thrust are receivedbythe direct action of the key aand knobsd, or the pins c, as either areemployed. p

Having thus described `my invention, what I claim as new, and desire tosecure by Letters Patent, is

1; A-shaftingcoupling, divided longitudinally in halves, as shwn at Aand A', and secured together by bolts passing outsidethe shaft, as shownat z' z", and with the splineor key a, `or its equivalent, formed uponor inserted in the'coupling, substantially as described and shown.

2. The plane bearings l, formed in a longitudinally-divided coupling,substantially as and for the purposes specified.

T. W. PORTER.

Witnesses: J. H. Denen, 'ISABEL Doven.

